Conservative groups are suing the University of Minnesota, arguing that the school violated their free speech rights by moving a conservative speaker to its smaller St. Paul campus. Conservative speaker Ben Shapiro is a plaintiff in the lawsuit.

The lawsuit filed Tuesday asks a federal court to declare the groups’ First Amendment rights were violated and seeks an unspecified amount of money.

Students for a Conservative Voice and the Young America’s Foundation invited Shapiro to speak in February. Shapiro, a former editor-at-large at Breitbart, has been greeted by protesters at events at other campuses.

They wanted to hold the event in a 1,000-seat hall on the main Minneapolis campus. But university officials cited safety concerns and moved the event to a 400-seat ballroom in St. Paul.